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atmospheric gases, especially carbon dioxide, methane, nitrous oxide, ozone and water vapour, which trap heat energy in the atmosphere.
the practice and science of classification. This is the part of systematics that is only...
coiled thread-like structures of DNA and histone, which is a protein, in the cell nucleus. They...
a molecule that accelerates (speeds up) a chemical reaction, by lowering its activation energy,...
a pure substance made of only one type of atom. An element cannot be broken down into simpler...